Screw driver for operating on pole shoes



p 6, 1952 J. DISHAKER 2,610,659

SCREW DRIVER FOR OPERATING ON POLE SHOES Filed March 5, 1948 InventorJOHN b. SHAKER Gttomeg Patented Sept. 16, 1952 rsennwpmvsn FOR OPERATING"ON POLE snons Jo an-shaker, oakland Calil, AppllcationMarch 5,1948;SeriaTNo. 124159 .2 Claims. (Cl. 41449-532) This invention'relatesta-equipmentadaptedto i the assembly of small .motors and generators,such as :are usediin the automotive industry, "and more particularly todevices knownas pole'shoe tools.

An'object of the invention is the provision of a disposed boss l2'lhavinga "tapped .hole' bored through. The lower arinjofthe casting In:is formed with an anvil I3 which extendsiniaii'ori- ;zontal :planeforwardly (and :rearwardly- .of the device as described, having aligningmeans whereby the pole shoe screw 'is brought into positive alignmentwith the screw drivingmember.

A further object of the invention is the provision of apole shoe tool,having a screw driving member which can be manipulated from a positionexterior of the frame of the device.

A still further objectof the invention ,is the provision of a device asdescribed,

wherein the,

screw driving. member is fitted with relatively coarseandrelatively-fine adjusting means. Tools of the type of the invention,in current use, are fitted with cradles in which a generator shell islaid, and the pole shoe screw .hole

aligned with the driving member by rotating and longitudinally adjusting:the :shell as necessary. The-turning bit is also operated byaleverwhichswings within the throat of the tool frame,

restricting free movement of the operator, and limiting the length ofthelever .that can begused.

Still other types depend upon ,a .hand operated lever to hold the screwdriving member in engagement with the screw-"to be turned. This leavesthe operator with only one hand free to do the actual work.

How the present invention overcomes the disadvantages of the toolspresently in use,'will become apparent during the course of thefollowing description, taken in connection with the accompanyingdrawing, forming a part hereof, and in which:

Figure 1 is a side elevation, partly in section, of a preferredembodiment of the device.

Figure 2 is a front view of the device;

Figure 3 is a section through the screw aligning dowel taken on line 3-3of Figure 1.

Figure 4 is a plan view of the screw driver as viewed from line 4-4 ofFigure 1.

Figure 5 is a plan view of the fine adjustment screw as seen from line5-5 of Figure 1.

Figure 6 is a plan view of the coarse adjustment screw as seen from'line6-6 of Figure 1.

Figure 7 is a fragmentary elevation of a different type of screwdriver.

Referring to the drawing in detail, the frame of the device comprises asubstantially U-shaped casting l0, provided with a base H, and beingopen at its front ends. The arms of the casting l0 extend forwardly in asubstantiallyhorizontal plane, the upper one terminating in a verticallyofzthe :boss 12. Transversely, the upperisur- .:face.of the :anvill3..is or" convex :arcuateformation-with its .center of curvature on theaxis of the boss .l2 and symmetrical thereto. Holes Ha permit the baseto be boltedito a work bench.

Adapted to engage the tapped hole f the boss I2 is acoarse adjustmentscrew [4, formed'atits upper end with a collarifi and a wrench engagingsguare section l6. The'screw i4 is bored concentrically for itsentirelength, and .forms a constraining element for the screwdriver H whichcomprises arod havingLa larger lower portion l8, and an upper smallerconcentric portion 19, formed at its top end with a wrench engaginghexagon portion .20.

driver I! is adapted to slide and turn within-the bore of the screw I4.

The bore of the screw .l4.is threaded for apertiono'fits length at itsupper end, and engages .a hollow, relatively shorter and finer threadedscrew 2| vhaving a head, comprising a collar 22, and a wrench engagingsquare section 23 similar to 15 and I6 respectively of screw M. -Thescrew 2| is adapted to turn on the portion l9 of the screwdriver H, andhasa thrust collar 24 which engages the shoulder 25 formed by the stepfrom the greater to the less diameter of the screwdriver.

It will be obvious that the screwdriver H can move downwardly,unhindered, until the point 26 is contacted, but that the movementupward is governed by the position of the collar 24 of the screw 2|. Itwill also be'apparent that the loca-' tion of the collar 24 can bechanged by either rotating screw l4, screw 2|, or both. The screw M,which has a thread of the acme type, is of relatively coarse pitch,while screw 2| has a line thread. This provides a double adjustment,whereby the initial position of the collar 24 can be quicklyestablished, and then further adjustment is made by utilizing the finethreaded screw. Protruding upwardly from the anvil I3, in axialalignment with the screwdriver I1, is a dowel 21 which is installed in'a counterbored hole 28 through the lower arm of the casting I0. Acompression spring 29, held in place by a safety headed set screw 30urges the dowel 21 upwardly, into a normal position as shown on Figure3.

By reference to Figures 1 and 2, it wil1be noted that a, generator shellG, with pole shoe P, has been indicated in phantom, while the pole shoescrew 8 is shown in solid, lines on Figure 2. The 3 Portion [8 .of thescrew- I shoe is simply aligned by merely placing it over the dowel 21.The screw S is started and the screwdriver H is lowered into engagementtherewith. Adjustment is made by means of the screws I 4 and 2|, and bymeans of this adjustment, the point 26 of the screwdriver I! is kept incontact with the screw S as it is tightened in place. Slipping of thescrewdriver is thus obviated.

As the screw S is forced downwardly, the dowel 21 cannot interfere withits progress, but is merely forced down against the action of the spring29.

Figure 7 shows a screwdriver l1 having a modified point 3| of taperedsquare section.

Torque is applied to hexagon sectlon of the screwdriver I"! by means ofa wrench, which in this position allows free and unimpeded movements ofthe operator.

While I have disclosed a preferred embodiment of my device, it should beunderstood that modification may be made within the spirit and scope ofthe appended claims.

I claim:

1. A screw driving device for servicing motors and generators of thetype involving a substantially cylindrical casing and pole shoes screwedto the inner Wall thereof by externally applied screws; comprising aframe of substantially U-shape having substantially parallel arms and.including a base for supporting said arms in substantially horizontalpositions to provide an upper arm and a lower arm, said lower armincluding an anvil and being of sufficiently small cross section and ofsufllcient length to permit of a casing and pole shoes being slippedthere- 'over tobe supported thereon with said anvil in engagement witha'pole shoe; means carried by said upper arm for holding a screwdriverin engagement with such pole shoe afiixing screw while said pole shoe isin engagement with said anvil, said means comprising a verticallypositioned adjusting screw having a, longitudinal passage therethroughto slidably receive a screwdriver having an upper portion of reducedsection to form a shoulder, a screwdriver in said passage, a-secondadjusting screw threadedly receivable into the upper end of said firstadjusting screw to engage said shoulder; and means for locating suchpole shoe on said anvil with its screw opening in line with suchscrewdriver.

2. A screw driving device for servicing motors and generators of thetype involving a substantially cylindrical casing and pole shoes screwedto the inner wall thereof by externally applied screws; comprising aframe of substantially U-shape having substantially parallel arms andincluding a base for supporting said arms in substantially horizontalpositions to provide an upper arm and a lower arm, said lower armincluding an anvil and being of sufllciently small cross section and ofsufficient length to permit of a casing and pole shoes being slippedthereover to be supported thereon with said anvil in engagement with apole shoe; means carried by said upper arm for holding a screwdriver inengagement with such pole shoe afllxing screw while said pole shoe is inengagement with said anvil, said means comprising a verticallypositioned adjusting screw having a longitudinal passage therethrough toslidably receive a screwdriver having an upper portion of reducedsection to form a shoulder, a second adjusting screw threadedlyreceivable into the upper end of said first adjusting screw to engagesaid shoulder; a screwdriver in said holding means and means forlocating such pole shoe on said anvil with its screw opening in linewith such screwdriver, said means involving a; spring pressed dowel insaid anvil and adapted to fit the screw opening in said pole shoe.

- JOHN D. SHAKER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

